19611858972 has 48 divisors (see below), whose sum is σ = 47498307584. Its totient is φ = 6291432000.

The previous prime is 19611858953. The next prime is 19611858977. The reversal of 19611858972 is 27985811691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19611858977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78304 + ... + 212967.

Almost surely, 2^19611858972 is an apocalyptic number.

19611858972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19611858972 is an abundant number, since it is smaller than the sum of its proper divisors (27886448612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19611858972 is a wasteful number, since it uses less digits than its factorization.

19611858972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291490 (or 291488 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 57.

The spelling of 19611858972 in words is "nineteen billion, six hundred eleven million, eight hundred fifty-eight thousand, nine hundred seventy-two".